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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6158de631e753879ad9203ecbf331317b0c5798258e399714ad81045eb992ae' 
  AND token = 'f0mmRqsO5W5j+P2dzOlLW3g5QYON5nGglyeXMCyULMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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