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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c166c9b66ebb8996b2ddef4bc23ccfad84973314f6d5fcce5b12e6b7584a4f7' 
  AND token = 'tUQt0i9wHExdTfIuSdiizV5HAPT3M8WZ+TSuktXByEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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