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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82c47da742702ebaaa0b016278a7574a0d54768f57fb5bc4b9e33404098ba48' 
  AND token = '3uQoZI17gpbQmhWoiLCIr668HxrxZ7Y5Zgj2vEIyWB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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