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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8677f6ddcdd9ac8feab215604513d434e59624d0bb4c69cc74c6c5f1c213e844' 
  AND token = '0jrfQmKgVynKyvhTMg9M555P2hW6WVEF/aeRGTI9BQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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