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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5f09142c02e92555bc9e264167302845c0b060501a470292289c3ae96a06cc' 
  AND token = 'K1rzn5TwXzZ6ZJAGki7R8UsfsFFSWOFjWvm9t0W05RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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