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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35ac2c189ebff5fe1a722a16a4e6d61d3a3771c2b96d36f8b25bc8212eb590a' 
  AND token = '9HAbi2W4vx4AGhUQawwctg+RZPnOD2ZVVf0TAE0O/mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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