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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ccbb3d0aff700efdb72a133cbf61caf1acc28237633dce7a4955123629c5d3' 
  AND token = 'fD2MnI8JOloAGDtWCWdd52FzTfJ7OLMB8FIO9lL5AKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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