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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d46f97c6e0152a40ba07aa854e07671c0cdb3344dea0da4a300c6a034650f0' 
  AND token = 'CkHEGlwcUOHq+MBUaQs44op/6I+dKj2LQYGjidoBdi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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