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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e2a483ccd2cf410b63405bd0d71c7ac082760f3edc7889a4d8f7623b54dd52' 
  AND token = '5L3biR6QRWUxvF6aWbp6cAzsy/65GOcZs4zN4NXQs+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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