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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2482e5e85b5c0950559b20a86077bb14379c8bcad8827f23e28dc316c3a0cc3e' 
  AND token = 'LMHJ34Vz24A4yLq9MRtJT1KknUj+Yf6QmywPMdwh3jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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