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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07208c46ce68130285c3a23426253dd2acc349db3dda828704d5d41aba92c00' 
  AND token = 'n1siz5B8lgpNr20lJpKrTxDCbI7t/+v+kK5eTG5CH7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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