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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbc9c704bed8b09f57fca26c4606b1cf0d161ffe6fc668eb3a2f4bbda43885e' 
  AND token = 'PuRjI92kSxCYmi1iBrqXWy705UAikH29vbIRCs7dboE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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