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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5efe77825fb67f978f155e56841657997c0e71795ce4af1fcc0d26936775e3b' 
  AND token = 'uDpi8knmmtJfBhWa/v6TUXkEhO+fwqfShsD+jC/18qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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