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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbd0677580c3ec663b7e8b09e787d7cf969174c3a5f75595091d793dfd207ab' 
  AND token = 'PU25W85lMmszR3Xepy8Xit7XDss5LfnrtwPzZ+ZqlHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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