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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b5e8283a41e1fa56089f0a821c28840e312661856dbd98d406d86ac9c77ccf' 
  AND token = 'Zs0T7wb0mTsJeIT6/BcJtuXzjNFhN2E8Q7m74bF4KHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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