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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9a94a3d7bb1b5695170b1bd487df7912cbec0ae60a6972cf8ec0963b323f22' 
  AND token = 'EJNZygytjYBoxN4aWFbe6zloa364hbteyv7J52tEsCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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