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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32925fe44946b3b1be4d8bc030f0c33c1834a86e8f1b8366a6b3fe9f056ab2d' 
  AND token = 'sczErH/N9L7XGbHYU1WRWFcUOjGZ+hsTm5jG8TLzV4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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