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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40be04d09e7d0349c57020c7a6e8a07a05106239cc0841614eff546c436ea785' 
  AND token = 'bM1qS8gy9sTR+6uWG/rAvgFWPpDBF5vgpHOb5F+HZ4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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