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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347b7132bd64f55a78ad3c83a22483c6a6f0c067b23ea49546680a51ff78fd72' 
  AND token = 'DpZm3RLCoHR2KGleNHRB+moLU8SQ9XxflJOQRLkBOrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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