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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28530ade7d6eb312d49ae9bf62b6ab8eb8af844d47fd063c744fbf3a1ab6a9c9' 
  AND token = '2MSj+/WtoWlIH1m7nZ67MIBmFqkQK0pPcpMbIRRur2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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