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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6893cb644ec56280a962ea11b77a4f75d8f76ca36ef1c591230e9e3e34190c1' 
  AND token = 'dRWZALe6jTWktQnoiqbtKSGLQe7pHQfWalRq7mrhmp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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