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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3570af403acf65c67ce2d6e50312a75839537fa47205391e5b12293bf535e1' 
  AND token = 'DneleXql5FfP3nXpCWzeCvorc4Y421JRR9qg4GItqNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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