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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4cd3b493fd24c542f978433c6e8ac363fa80cb1b74ac4c2adaecf94474f5f40' 
  AND token = '4iI7o96RNvjaIF28Fes/AJbWFmnYAPaNUb9lo1xxAQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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