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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f5b8403d3e07ff0483761a7b68155a3968950c976670de08d9d6ce96884863d' 
  AND token = 'ik1VDkklZuN6sH40qEWsgblFYOuEZsoBZAv23nvIyqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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