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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f351da781a4e6a3c9e814b2a1d8e5a65c66eea00551e97e3d3521ec71d264b7' 
  AND token = 'Ws3eemMc6oPDMEZMGycAiw+EXezEc9YskjKegMCTCpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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