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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88a7c0cd695e74e34259e32b7d9ee91237ebb74c7d9b470dc58b2c3c320f390' 
  AND token = 'pyedcnO2BxrhgJTEuIywFNytfKEG3sPyd/sJh2e2BYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00394

JSON explain

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