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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6001b5ae10f43d8501ffdfcbc181f9a5657e12b694542caa6c7d68cd3a81174' 
  AND token = 'KTKfa5VHkT7wd8jZzrMBMitg7LnP2bqaWHVMwgWMEMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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