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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70121c02ed44f66894baf7454556c10361f64a7fc2e19e27a2414d3e67c4e13f' 
  AND token = 'bXqxtoxtxijT1YbM0dU9OqMyQ2pELcdrbDNYdqa0MYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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