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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8070d2ef2183e88f8794fd0f92147975faa7e788afdbee9102224310460e2af' 
  AND token = '9pPG2g9TAP88fKC5EWzhsuoCkCt90APQapgGkp8TmvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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