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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bcee05631c5a1c45a8aa763428d3326b31a32289f09ced1fe7d3024f41f9ed2' 
  AND token = 'uIZUiWh/dRKVnWcetRwbapiqRceYnDxj0+x+Xd4+4Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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