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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8dd0953a2bb31024ad8596a5703c0c2d2aaf17950558d8fb5a642a579d0af0' 
  AND token = 'l9boyQHTzFoxYXhI0wADNpq9yDBi7xrTifk382e+fLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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