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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1580d15ee80c0440730e51ef7c6308512e145ab32b0c11a1465121c76bcf47ee' 
  AND token = 'DGN4BnUVt36JD+TU8bbtYgmtMECHyg1EYx77GGOpDpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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