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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06202c762fa45adf06770ab27a03dbb0a8c0bab585acd0ef8930790f5e3df886' 
  AND token = 'xhoQZgmJeZDZQhS+D7w/xUcxz60PQE8bM24Ai4lEcLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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