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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3c9c5014d75ce789b053b5d5e4f12b5028bcfa1650cd922428590c06879450' 
  AND token = '4ShzNRJpdYJN175PFbcrsKx0mWOTxNJkP9iwuWQQKJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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