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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5cb88201d315609dd027168f498f53ee1be0b4f9665e8a49ad1f5b6ee93e11c' 
  AND token = 'iaOgl2diMe7Y7VHsSOZjBG5Ef0RcT+yrDkHQUhasQFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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