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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd63779521c7b0f77a9d06c0b6a1056157bb6eb2b71134140c4f5990ea1cd37' 
  AND token = 'l9suosZbuEAYvXLjxzanwe1a8bto1+Ra7eHu0OB8WZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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