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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a9046b47c20cd1a9e6cde8a824060680c15b3dfa9699ff5e02cf9c940c61fb' 
  AND token = 'GsFekqWFVZuxIHwlqZ+/HVoxWNT4wwUoV+tqBrbzu/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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