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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae61a30d29f631b4ab7b847c78c59a3e6906fca859717ed65487a497b1608a38' 
  AND token = '/fsCWjt9aFfqOqs+jND3C3ckLoahlg++PRDzWuDtVuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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