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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85033aeec5b970997352f77f0ecb401885d1cd04679c222b76a296e79fd6aeca' 
  AND token = 'io5QUFtSr2ThxNSYsrf/JqBmH/MlkeWRo1Wos/SFTjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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