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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1465a2e5269e0bc4eb544f389ca582a509db8fbfce6b7342d3efa8d03e4e395c' 
  AND token = 'tdlPN5c51/X78zGxlSLBWPAyQ1MfduV4Fct2PFaN8DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}