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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b41f65a2f704760ac61074d2ca038a910a2d86898ed32d9137de8891cec407' 
  AND token = 'xIDxX58IbiHSEh8jPlAPJP3ZFoKB3+KS6D4msR1T3/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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