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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2f3821ae6e2349d76d7fe102d377a135438b3c213eb6a2472b7722dd20e00b' 
  AND token = 'IwkveVpmIavxrgDstU0Mm22FP6lh2lafegGXUe/mbsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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