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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb318e27eef6cd1cf1b5f9adcdeec0d9ea51033f20d1a8d678d440edacc88ba' 
  AND token = '5pdIAKAdgxn59Ba7d5yMxBtzU2l+U8DKizXXv2scIpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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