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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4be300eca8ce6ae826a67df6248037447e9e699c6655613fe5b6c986440a3c5' 
  AND token = 'KDDyUZ9eBNnMgcOWR+OW2CwY7uIIvuqC3rF5nWY7Zos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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