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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc48461372ac73cbed82b83fa2a74a3c4c95c8b5bf5212bdd67543cc85140e52' 
  AND token = 'G3fDbUkjRi0IOQMD3B1Kart8KzgAV9SiEe1I/PYnho0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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