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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1e93f54e2b7566cd070c7f74cc2376ebaa3f5905940b47f9584c601b025fff' 
  AND token = 'TCtThMiw5FmU+0mh0Jswz+auPPLWErlulOdSXyeosG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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