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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9bccdc95672920888b0712fbe8c18104597bd797644ec347b09a9c7241a8a8' 
  AND token = '64ogjm25nMBgIY0z8n1nYSRMX6NxaFk5aAG9IYP7Bxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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