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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7395de4ca485c6144d8935f3ee9c11c14943205e74a80b665d420fe97286ef' 
  AND token = 'G028eOd2o0bBauObamMqOs6M6ehZVF0WR1+696uSgNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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