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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9a753a92180db2534b286129273785349b160a03ebf28279a1c2bef45f509e' 
  AND token = 'ZBKZkLvRnjZ00Vc3E1yWH07dEeQc3d58elXr1qaG55A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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