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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803ecf5e6d5864e76fb46e0ba052187b79c0360b7b5b311cf21df8e2110c7fe0' 
  AND token = 'KLLx7qGn7mgvskLb9ANz8GLq8BND68PiBoQU9Wci7Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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