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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3e329e7287e238e92b711e2fb73eb453d0a37bedb4a19803cbd5c802ccc969' 
  AND token = 's+GpmP7W/3btZad1wtW34ee8XUKa0wuvTH3Pxb9cWxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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