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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887179bccdab8a421152a7a1928e50c1935e464dcebdd088d44ca60e6e3a6018' 
  AND token = 'RySYHR1ZTY5mzOH3HtASfEmiyW1C3pavF1ruL2UvGkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00174

JSON explain

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