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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa8d9e2e7a1879cdccf0c1f081d4b87047324b977be8f857026a5e40c4da350b' 
  AND token = 'VZJBUAQVFoFZia3EQ5yx7fSxahQh30iwtB0QAbcNYlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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