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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '226dd31f7bcccab23d8cac7a235cf1c7bcbba9cd3fb69d6a5df40ffff0760eb7' 
  AND token = '3Z7cGOtFIi79EixHeu9be8aZlv4ySru4ovaG3s2zOj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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